Not only is Yellowstone National Park the place to go for geysers, NPS said, “A mountain wildland, home to grizzly bears, wolves, and herds of bison and elk, the park is the core of one of the last, nearly intact, natural ecosystems in the Earth’s temperate zone.” There is such huge animal diversity because of the Greater Yellowstone Ecosystem. Regarding the mammals in the park, the 2013 Yellowstone Trip Planner (.pdf) states: “Keep your distance. Federal regulation requires you to stay at least 100 yards (91 m) away from bears and wolves, and at least 25 yards (23 m) away from all other wild animals, such as bison, elk, bighorn sheep, deer, moose, and coyotes.” The Yellowstone National Park Service says of the wildlife, “Yellowstone is home to the largest concentration of mammals in the lower 48 states. 67 different mammals live here.” These pictures show the diversity and a wide variety of magnificent animals of Yellowstone. [60 Photos]

Wild black bear close-up at Yellowstone National Park. The photographer wrote, “This big bear was grazing in the late evening near the road just east of Floating Island Lake. He grazed towards my car then gave me a quick look, so I was able to take this from about 20 yards away.” Yellowstone Park Service explained, “67 different mammals live here, including grizzly bears and black bears.” Photo #1 by Pat Gaines